Java实现数据库中查询出的数据转存成excel表

@RequestMapping(value = "outPutExcel", method = RequestMethod.GET)
@ResponseBody
public void outPutExcel( HttpServletResponse response,String officeid,
String sonid,String nameorphone,String beginTime, String endTime,String option) {
		String nString = "";
		try {
			if (nameorphone != null && nameorphone != "") {
			//对前端传的参数解码
				 nString = URLDecoder.decode(nameorphone,"UTF-8");
			}
		} catch (UnsupportedEncodingException e2) {
			// TODO Auto-generated catch block
			e2.printStackTrace();
		}
		response.reset();
		//设置浏览器下载的格式，并以当前时间的毫秒数命名
		response.setHeader("Content-Disposition", "attachment;Filename=" + System.currentTimeMillis() + ".xls");
		response.setContentType("application/msexcel");
		List<PurchaseSum> list = purchaseService.selectPCSum(officeid, sonid, nString, beginTime, endTime, option);
		if (list == null && list.isEmpty()) {
			throw new NullPointerException("导出数据源为空");
		}
		HSSFWorkbook wb = new HSSFWorkbook();
		HSSFSheet sheet = wb.createSheet("sheet0");
		HSSFRow rows;
		HSSFCell cells;
		//设置表格第一行的列名
		// 获得表格第一行
		rows = sheet.createRow(0);
		// 根据需要给第一行每一列设置标题
		cells = rows.createCell(0);
		cells.setCellValue("客户姓名");

		cells = rows.createCell(1);
		cells.setCellValue("客户电话");

		cells = rows.createCell(2);
		cells.setCellValue("下单日期");

		cells = rows.createCell(3);
		cells.setCellValue("订单号");

		cells = rows.createCell(4);
		cells.setCellValue("所属分公司");

		cells = rows.createCell(5);
		cells.setCellValue("签单人");

		cells = rows.createCell(6);
		cells.setCellValue("品名");

		cells = rows.createCell(7);
		cells.setCellValue("型号");

		cells = rows.createCell(8);
		cells.setCellValue("颜色");

		cells = rows.createCell(9);
		cells.setCellValue("尺寸");

		cells = rows.createCell(10);
		cells.setCellValue("材质");

		cells = rows.createCell(11);
		cells.setCellValue("已采购数量(件)");
		
		cells = rows.createCell(12);
		cells.setCellValue("采购单价");
		
		cells = rows.createCell(13);
		cells.setCellValue("采购总价");
		
		cells = rows.createCell(14);
		cells.setCellValue("已出库(件)");
		//循环数据库查出来的数据集，对应每一列赋值
		//此处list.size()本不应该-1，因为同事在list集合里追加了另一条数据，导致报错故将其去除
		for (int i = 0; i < list.size()-1; i++) {
			rows = sheet.createRow(i + 1);
			
			cells = rows.createCell(0);
			cells.setCellValue(list.get(i).getCustomerName());

			cells = rows.createCell(1);
			cells.setCellValue(list.get(i).getPhone());
			//对日期格式进行转换
			cells = rows.createCell(2);
			String dateString  = list.get(i).getPlaceOrderTime().toString();
			Date date = null;
			try {
				date = new SimpleDateFormat("EEE MMM dd HH:mm:ss Z yyyy", Locale.UK).parse(dateString);
			} catch (ParseException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
			SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
			cells.setCellValue(sdf.format(date));

			cells = rows.createCell(3);
			cells.setCellValue(list.get(i).getOrderNumber());

			cells = rows.createCell(4);
			cells.setCellValue(list.get(i).getOfficeName());

			cells = rows.createCell(5);
			cells.setCellValue(list.get(i).getUsername());

			cells = rows.createCell(6);
			cells.setCellValue(list.get(i).getProductName());

			cells = rows.createCell(7);
			cells.setCellValue(list.get(i).getType());

			cells = rows.createCell(8);
			cells.setCellValue(list.get(i).getColor());

			cells = rows.createCell(9);
			cells.setCellValue(list.get(i).getSize());

			cells = rows.createCell(10);
			cells.setCellValue(list.get(i).getTexture());

			cells = rows.createCell(11);
			cells.setCellValue(list.get(i).getPurchasedNumber());

			cells = rows.createCell(12);
			cells.setCellValue(list.get(i).getPurchaseprice());
			
			cells = rows.createCell(13);
			cells.setCellValue(list.get(i).getPurchasePriceSun());
			
			cells = rows.createCell(14);
			cells.setCellValue(list.get(i).getOutlibraryNumber());
			
		}
		try {
			OutputStream oStream = response.getOutputStream();
			wb.write(oStream);
			oStream.flush();
		} catch (FileNotFoundException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}